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' P; W. 00B 85 0. A. HOPPNAGLE.

, BOOK DRILL. Nojz sfisv. V Patented Mar. 25, 1884.

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UNTTED STATES PATENT OFFICE.

FREDERICK W. GOE ANDOHARLESA. HOFFNAGLE, OF VERGENNES, VT.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 295,737, dated March 25, 1884. Application filed May 17, 1853. (No model.)

To aZZ whom it may concern.-

'Be it known that we, FREDERICK WV. Con and CHARLES A. HOFFNAGLE, citizens of the United States of America, residing at Vergennes, in the county of Addison and State of Vermont, have invented certain new and useful-Improvements in Rocl -Drills; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to that class of drillingmachines which are used for boring through rocks, and in which the drill is given a verti cal reciprocating aswell as a rotary motion by mechanical means, the object of our invention being to provide a drilling-machine by which a rapid succession of strokes and turns will be given to the drill, thereby ac complishing quick and effective work; and it consists in the construction and combination of the parts by means of which we accomplish the end desired, which means will be hereiir,

after more fully set forth, and pointed out in theclairns.

. 1n the annexed drawings, which illustrate our invention, Figure 1 is aperspective view. Fig. 2 is afront view, and Figs. 3,4, 5, 6, and 7, are detail views.

A represents the frame which supports the operating mechanism, which frame is preferably triangular in shape, and is provided with adjustable legs, A. One of these legs, preferably the one shown at A is pivoted at its upper part to the frame so as to be capable of being adjusted in and out from the frame, as well as vertically, by means of a set-screw, as shown.

To themain beam of the frame A are secured the beams a a, which serve as a support for the operating parts of the drill, and braces for the frame. This frame is provided at its central portion with a perforation, 0,

through which passes the drill-rod, and to the upper part of the bar a of the frame, at a suitable distance laterally .from the opening care secured two uprights, d d, which are provided with slots, d, at their upper ends. To these uprights are secured the frame D, in which the spring and gravity actuated hammer L operates. This frame D is provided with ver tical longitudinal slots, (1, and a circular opening at its upper portion, as shown at (1", through which passes the hammer-handle.

To the converging side beams of the frame are attached standards, E, which are provided in their upper portion with suitable journals for the reception of the transverse shaft F. Secured to this shaft adjacent to one of the sides of the drill-carrying frame D, is a wheel, which serves twofold purposes-the same acting as a fly-wheel, and being provided with concentric projections, G, which extend beyond the periphery of the wheel and abut {against a rod attached to the hammer L, thereby causing the hammer to be raised when these projections come in contact with the projection Z on the hammer L. These projectionsG act as cams as well as spokes for the fly-Wheel.

To the center of the shaftF, at a point oppo- 7 site the base of the hammer, is secured a cam, as shown at H, which cam may be provided with three or more projections, h, as shown. To the opposite outer end of the shaft is also secured a waved wheel, I, the hcreinbeforedescribed parts all being secured to the shaft F rigidly, so as to rotate with the same.

Attached to the frame on the central cross bar, a, and at a point opposite the cam H, is a standard J, to the upper part of which is pivoted a bar, i, the end of which lies over the cam H. At a suitable point near the end of this rod is secured a rod, is, which. may be provided with meansfor adjusting the same, as desired. The lower end of this rod 7c is attached to what I term a janrwrench, as

shown in Fig. 5 of the annexed drawings. The

opening in this jam-wrench encircles the drill, which is preferably octagonal or round in shape, the opening in the wrench being rectangular for the purpose,'as will be hereinafter set forth. Attached to one side of this jam wrench K is a rod, or, which is attached to the lower end of a lever which is pivoted to a projecting portion of the vertical standards E, said lever N being provided at its upper portion with an anti-friction roller, m, which comes in contact with the face of the waved wheel I. This lever N is provided with a suitablespring for holding the same against the face of the wheel I, said spring being ar-. ranged so as to draw either upon the upper I I portion of the lever or press the lower portion of the same outwardly.

The hammer or weight L is provided with a transverse bar, I, which passes through the same and extends through the slots 07., one end of said bar being preferably provided with an anti-friction roller. Secured to the upper part of this hammer L is avertical rod, which passes through the opening d in the upper part of the frame D. Immediately beneath this opening is secured a spring, which encircles the rod. This spring is for the purpose of preventing'the rod Z from striking against the end of the slots d when the hammer is raised, and when the hammer is released will increase the force of the blow upon the drill.

Having thus described the construction of our invention, we will now proceed to describe the operation of the same.

When the machine is placed over the rock in which it is desired to drill a hole, the feet or legs are adjusted so as to accommodate the apparatus to the inequalities of the ground, or to adjust the same'at an angle when it is desirable to bore a hole other than straight, and the drill being first placed in position, as shown in the accompanying drawings, when the handle at the end of the shaft F is rotated it carries with itthe operating parts, which are rigidly attached thereto-that is, the cams and fly-wheel-the hammer resting upon the endof the drill between the projections G. \Vhen the wheel is turned the projections G come in contact with the arm Z of the hammer and raise the same, and as soon as the arm Z passes beyond the end of one of the arms G, the hammer falls upon the endof the drill. The cam H, which has its projection at an intermediate point between the arms G, raises the latch-bar z, to which the rod k is attached, thus raising the drill between each stroke. The waved wheel I, which is similary arranged upon the shaft with respect to the arms G, will give to the lever N a reciprocating motion, which is communicated therefrom, by means of the rod 0%, to the jam-wrench K, which jam-wrench, when thus drawn to one side, will bite or clamp the drill-rod and give the same an eighth-turn.

It will be readily understood from the accompanying drawings what is the operation of this jam-wrench, which rests upon a suitable bearing provided around the perforation c in the frame. When said wrench rests upon this bearing, it will not clamp the drill, but will allow the same to operate freely in the opening; and as soon as one end of this jam-wrench is raised the edges are brought in contact with the sides of the drill, and will hold the same, thus allowing the drill to be rotated as well as raised between each stroke of the hammer. The upper part of this drill works through a suitable loose bearing or plate, 1?, which is secured within the slots (1, thereby keeping the drill in a vertical position or on a line with the perforation c and the face of the hammer.

The frame D, within which the hammer is secured, is pivoted to the lower standards, d d, and is provided at a point above said pivot with a projecting pin, which passes through the slot 01 in the standards d, which are also provided with spring-catches d*, which hold the parts in position. By this means, when it is desired, the frame D may be tilted for the purpose of removing the drill from the hole which has been bored and inserting a longer one.

Thus having described our invention and the operation thereof, we do not wish to confine ourselves to the exact construction herein shown, but reserve the right to vary the same without departing from the spirit of our invention.

What we claim as new, and desire to secure by Letters Patent, is

1. The combination, in a rock-drilling machine, of the frame D, carrying the hammer, and pivoted as described, a shaft, F, suitably journaled and having keyed thereon cams G, H, and I, a pivoted latch, '5, adapted to be intermittently lifted by the cam H, a j am-wrench,

K, connected with the latch i,- to be lifted therewith and bite the drill-rod, and a lever, N, arranged and operating, as specified, to rotate the jam-wrench, substantially as set forth.

2. The combination, in a rock-drill, of the frame D, carrying the hammer, and pivoted as described, a shaft, F, actuating means for re ciprocating the drill -rod and hammer, the waved wheel I, lever N, having spring attached thereto, so as to keep the upper end of said lever in contact with the waved wheel, and a connecting rod, n, attached to the lever N and to devices for rotating the drill-rod, substantially as set forth.

IIO

In testimony whereof we affiX our signtures 

